Channel 4 is to broadcast a "dramatised documentary" based on the theoretical scenario of Prince Harry being taken prisoner while serving in Afghanistan.

The 90-minute film, titled The Taking of Prince Harry, will depict the prince being held by the Taliban as negotiations are carried out to secure his release.

Sebastian Reid, the actor playing the prince, will be shown in the film being forced to appear in Taliban and al Qaeda propaganda. The programme will also feature contributions from intelligence experts and former hostages.

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Harry was deployed in Afghanistan's Helmand province in December 2007, but his presence was kept a closely-guarded secret over fears he could become a target for the Taliban.

The prince spent ten weeks in the country as a forward air controller until his deployment was leaked on the internet, leading to him being flown home in March 2008.

Speaking to PA, Channel 4's head of documentaries Hamish Mykura said that Buckingham Palace had been informed about the film, but had not seen it.

Mykura also dismissed any suggestion that the programme would increase the risk of high-profile kidnappings around the world.

"I think it is just wrong to say that this would create a new idea that wasn't there already," he said.

The Taking of Prince Harry will be broadcast on Channel 4 at 9pm on October 21.